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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b4b69a9b04c447c7f1b594590838b2ea6dfd32ea2e2e9e4dc450f77d3988ee8b' 
  AND token = 'mhEvNdyZOfmHfUS8njiGr6cUAvTyp4QrFdHudKByqsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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