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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd7194ded1c4de66f64f2db69419b5989b4ef7fd4079fbb318eff8328680af5ea' 
  AND token = 'yhEwXKaiumzXvS/mtMHNdboG7JEPPGoN3eQPR4u8U+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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