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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b23860929897b68173670a8cfc1a5a3b3699b05720bc11a9bdbf76ff8a407bfe' 
  AND token = 'eoh0RPwsuow+lfWdKb+waAx8aAvd1Z+Pp6Lc8CW4Png=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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