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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6bef88dcdfdda5b921550e4ca03e577e42763eb7d3ee8dd1da127936c0b141a1' 
  AND token = 'lMckRHkaAX66PfH/eIlwqRdCyi9rOJ0I4lfe9WERcOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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