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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5bac1a2fcb5ab4f65dff528ff55cdaf127efb9d39140d38447a9268dd04eed67' 
  AND token = 'FVaC4r0QL1iqNdj8McuEfiJJFIJvKdfBckv68PrP5r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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