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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a59c20340d64ae245106892f290f4cde18e17aa37f6cbeac491058cea5196ebb' 
  AND token = 'nNLsssD9eI1gL8BhoOOpZjNKqMd3KtFWcbNd9c3y+5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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