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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '773e769429622b34f631bfe092a1ffce9955e40a5afdc0317abca3d2c6c49e25' 
  AND token = 'Hw6c9ssY94eOTH7ZMiTEXY6/mvQtHt5eMbPrnIQmDmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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