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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f586c377564b0ccacce6b4b9f35ceb9ac65ac343c3a305202bf3d510c2116d00' 
  AND token = '0+waO0sepcu3x+n3PmoN6B9DksDyOSECX1dfsQPJlxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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