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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8344ff886df3a11bfd56f3bac0e6aef7403cc822a00dc6801a55bdbd0aa0e7bd' 
  AND token = '+TTjrAtyHad/cFOOOUuRZ2CxoUF9y6sClelR5OtAwGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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