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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '529924ed459cc3818fcfe7f7b2db47942d133e3f0e1da9ebc6bb6d83852bdd38' 
  AND token = 'ZBnRZ9a00ZloxPddm4ZHZhZ/RXf11BSDEHRbv/mAK7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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