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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '55ced5e2f26feb5c4e4de9ed8b2dc39a12e01055d3a423c672443f90f69c5bac' 
  AND token = 'rWWJ5v6cw/ItlcFX08HvjFPfTCi5Iy4Ky2SZAzmqeOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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