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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f625497be79eeffa0abc098fa4a8339f1933453b3d636d0c4f6a60f0c4f15afd' 
  AND token = 'Sk02qTuXtfogme/cGChfd15oMHDDN0M7pSMpLFRZkrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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