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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '65ec8551624c19a2abf0f718ad1e0d70eed80f70332dc9114044652763c1fbb4' 
  AND token = 'nVFgWyslmeN2J1iIRS/kYFF3AifoWT82/GEWk/Oh9tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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