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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '510f579ecdfb3e824308ccf3dc1bf87761d44d84e51a1c08f363f7581ac0a04d' 
  AND token = 'oi5cl+bvvIYpdcXIvPE3vrSQjOAJCVTyAk78jud2A+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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