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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b720691785c231be15831480ab89c3954065388da3e5cbb009f176175ee6b8ef' 
  AND token = 'UpO3qNqB28Rba7E3jNFANS4zV9gWRAo3rRG+cwA1ckI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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