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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '812f863e43ce06c4efed4e2c5972e102b82bfbc5e7e793769d3b9803e26a7d4a' 
  AND token = '3mNxNLfLk1r9AghZpI+k5geC7oaSE8D1cmQZlH/3KYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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