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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '70e8d0eb06522f6391149c4c78ace2932af93e3b4033bb67f382ed99432b515e' 
  AND token = 'mz/kacQupUpi0+yRSsHaNRubqHSWb7PbEndPH+GeIIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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