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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e20e812b0f842d8eb6adc08f2e0692ef5f2f9774e73fd30f5a60484fa3913ad7' 
  AND token = 'vrL5YNko7+Aykf3m2J2ZHAhupSvYMziea7tARuzTkUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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