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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '922aafd7999b8926fa4d4d162c5831a0cd0ee7d5f46a6cf686e9a3956381ed98' 
  AND token = 'Ld5/KsMLSo9WHt1sPo/mfaGUWaUad2pQkJzO3jaE2h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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