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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0fec5919bd31a1f446d83b071bb1aba7bea9e320aef59b9877ec69a474b0c36a' 
  AND token = 'f6Zo11FSjqETifnHVDm7mVIDkwE2FgJmL6rer2soUn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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