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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '58f9f832ae5bd773b63b7752058c655a1d27dc598d01c4130118500dd3e3c378' 
  AND token = 'NbvS91H19f5QArBRY+43MWebpD9qIqp133EDcP/b4Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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