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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cb80deeee18abaff56399ad70ee8cc1ccf2e5d3b66241069ec5798d2739eb22f' 
  AND token = '3ccDobV8ssqT6KD9aA5UXQ2JZwxEW89eSRAHZZtjj34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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