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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f9523755a2bf591ff45090cc62954f1d76c9d768e6d664a24544964bb8a6721d' 
  AND token = 'qiMF+cD6Nj2ApPG9Alnj1tMzfPYCy+tJVz0f4mnSRsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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