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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b3a2e2da6a39f177e224dbeaec61d9778c76f90ccef1631467aed1360cb51967' 
  AND token = '0O6Wn4Jbl5cRIhLOasCCXsuTnKonPNavoHyc8VqnWjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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