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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '492c5e8792405ff3ffdf138d33c346b72d4c5f81fff8f83ae2654bf3253e6249' 
  AND token = 'kgM9ZA7Gacv8udLssVnnMQEq3U9o++jFdRz7Bqi4RLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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