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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '787ca5b8ddb7509f389d40ae0433d74c7e4eb14f240e74806bf923333acd8afc' 
  AND token = '4qifW1zCDRPIQdwrangwPFYJft/k+m9qC2xsQ9WD9fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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