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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '953aa7056f8cc6c6e677f23e7e99e6d575131293f7e19e2e144adf59769470d1' 
  AND token = 'p97NbuLiF0VLRBY+Ov7aDPVQdahxdaxt4aSR5jcwYIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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