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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd2eabf588aa068b011d61299f65500a38359db6be567fcb22c826eae3226cebf' 
  AND token = 'e+I9GYzxPjm9JaISWdjEtMYIn7oSLtGQ0Jylwmv2tQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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