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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70a3848f5e7224439de6cd5255c40436596f39d1583a1a7845722efed2220dfe' 
  AND token = 'jONwyNJ47ZUjbl/J99lisvFra+4X3CI3le3m/nC4lkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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