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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a62e8bf0b19e64ca12e1bc1c89fe2adaa098fec03e5629601ead968cfd213362' 
  AND token = 'fdMKtB5OQrhXjdwFAR8DBYWAKy2WLG7Fl6LL1f0PLNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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