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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b20d8d263af96a8eacd3abb6a0960b74f74c953e2506dcfba79cd0eea63074d5' 
  AND token = 'TWe9UYfqOJ5eIsRAlswewA/cmshCGC92hPT6OXS93hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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