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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c4f1ee093f0bfb35661ec0e5baa4f60dcf31c100888a3fe37de6342d6e63f3b2' 
  AND token = 'iErIWHHyRsrgMGl0YvssSK4W/N7pxsmsp0HSTM/sk2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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