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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd801816d710874cea44bb5fec149a626040f92c5ce6920f28ad860bdb168ed05' 
  AND token = 'y1Jrjz94oP36Aumzx2csnQaF7tZcWPg0X9lDQ/JF99U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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