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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9cb6475e1ea1feef7f1952cf501a4e12732196135b5ee0eca575000a54dd4f59' 
  AND token = 'fK7i15eSU3uGF08aMQ+Hw9tbr76L2bPTTLWaKtVCmkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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