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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '758c90c34f452a1b631109ca9eb317e0bddfab74a72f8d98209f56401f388774' 
  AND token = 'PDZ9yIZH3e/mu7+3pV0ty2cv3SJn4+G508yzNcsFybE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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