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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '60465065b39a9ca77d9462378c5e921c65ed07cb276e58a7655b80bb06969eac' 
  AND token = 'TRi9YFE/pTDQM1ykTfe+Jg5UJBw4M1vXyuL1cJis0Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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