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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1bf37d75c293854d83ef5f9e9a921c01d88d5afd4eecf446b6f0135e1bdc02be' 
  AND token = '50rDk4xAXdQ/GntHlelSisrfk9AB+hIIgoNboi7kP+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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