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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '94bf8d4ae2b1e315d69256e51a401ab028aa6ca61ac45d88ac569acbeca39788' 
  AND token = '3G/rvy4SgSjpBUOEj5EZOhE5r1yT9QNwKTm5F0FNB2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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