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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5b0b277ed18854a82070b79d7493b4cf16ddd528d76a27bfd6645ed096c7f7fb' 
  AND token = 'ukmHZz42o/TH6R8MCcfu/uurpRHXjiKkDt/m2RIfpjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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