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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a125677a33ebb88e32e4d23970b1190c142c6745e1b238870d4f7d8bc47bb67f' 
  AND token = 'owkFWbWEX6I1FY2G0NkIlAmb86iNfPHWLERPFui6ExI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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