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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7fbf9a27bcd1b3e38765c5616cf26c3870430e8cb5a5b9ffd90b5cd3954eef2e' 
  AND token = 'xIvw0AcX7UhLJGAHfocUwkv1kCSDRf2UEbK9PgrwMEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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