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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b42b3a9fa46d9882a2d895581e51a8f827a53bffc28cfd7e41b552ef5c81b501' 
  AND token = 'nOfF7nVvojM4hDvvVikga4AK6dY/Wfueei7DIKhBJek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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