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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f4c905d5941f7f6a49f185ddfbc7fa91b298a03d72ce48198dd9df98f11cda9e' 
  AND token = 'KO/SdOO++tDKQ4E4OZGb/PnJ7gErZ3fJyeK5KAaHMDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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