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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '01cf821cc09e4096f417035c49cc99f6ed6d04aefcc5f4a9784fa6eb5da64bb9' 
  AND token = 'xP0kaQfADp8/X4MOkuN62DzWMSg0isx4HsDry3vtCpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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