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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5b0d497b8a93b3bdd09d8b3478603bb68045e7efefe8ecfc5d5beca9638c3ab6' 
  AND token = 'ZOlLm+kY67+dCav8g/H3g3kmLN2FSH71KKm4X0Rh4L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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