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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd4e805f2d16f2cc5bd707453c7784caf53ac28e1a9ed53a0683c53b65d8ee376' 
  AND token = 'tKaB9KrQlYnH2WhRLvDL6gZ35WbNdya5tB/CNg6Ibw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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