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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a959677464e0be51452937af108a7f209ac1f7c14b5b615c861531e2f81cef2e' 
  AND token = 'FflF/VjnT8LSusuWqoi+9J4JCnmK9rhq7aEM+01+KEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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