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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '04a2a973b9190dce113c9218e2ad20f8822a2f3f813ba5a99d3158340656d41c' 
  AND token = 'kN2uizlacTPQdm0zTfdcVR/zGjy2/+KRox02s1YEmB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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