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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd06875fe9519f1a5e85fb0bd65619674638507e429f9c4991674a7c7a2c19287' 
  AND token = '7PzpyN787IxNS7tkcMpnQSWv+mFLZvbH8Fm2QaEfx+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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