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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd9164428e7c10f8fe7a67d35cf359c414da70949f15aa0111751008888e97cad' 
  AND token = 'eWfLf1yGs+MAQr66dWlycG08xLpFndf2imvAla6VP4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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