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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'acbdb877c58a679851f6301e89762b1e4f860cfcb1cc3023aba3b2097d0a1fa7' 
  AND token = 'jXP5mMIjjvmXfp9obK806mBD/7t+oNsAFYWfpg2xdMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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