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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9851babec21848132f5fb0b1b37c10e5c609a8ef826c7658ece2ae595dcbdbc6' 
  AND token = '9o/Wxnc3CNh75Fm7+O77KiTjHTIE/4dSCu91/CrJnYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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