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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fa359f73c56a6bbbc0a3798b229afa779fd4c763588e8b2fe0f91dd4bbe6ecd7' 
  AND token = 'm2qr1Jnx5jh7rdZZ7zTM9BuISUSuHtK/FS0AuTk93fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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