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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6bf84779ab4b0b4621625ec905afada13cf1007cbccb4cc089454d485bb1c274' 
  AND token = 'Y1f3RZAPmfuAfr5xyYkSX2icsaSTpylv7n0Bzy5cmCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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