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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5297a2088e2aeea7a658667cbdc9d084183c6e1871c0326b939ac5e444ccc089' 
  AND token = 'crG5yJgbBRD20NadsnA5p6Egw4q4GbrVjyxNdBh+BIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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