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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '75a5739db6af31050442fd65f1fb39d09f81d9f743d47f2ca5a8c91f4b5f94b2' 
  AND token = 'rFdBPPB52dIRuFi0XnAF2J9Dkrra6j0UbcTFKBRpKmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}