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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7b132ccb4fb0bbfcbd92be961aa09e96a935426a4cd5704cec83f314e82da863' 
  AND token = 'vam5iNVpmeGIRdjgPGgEbdEEi8SqIew/hxXwcydRxLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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