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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c8ffe5d48ddeb3a606fd442ac0ebf6604a406fded1c652dbe84d64d58e62fbcc' 
  AND token = 'OuSPK61NrCMvjcr3PsilflTzF0R54BaZ1M6NOwOeQdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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