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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd2b544d0e709a1264da7da84ff7b47dad9ef973f217409a01758c96c79d4039c' 
  AND token = 'WWu9njepCRJf5moKdJ9LljT6yzPm6wWlQRyw+K9i6Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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