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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8421688e5c1a27a121b19012ad35c2ee7ab876ed344064b7bcd106b7546a17a1' 
  AND token = 'qH7QKvAi/TeJpJQLYqs+Oy0EPiUtwyr4kMfO1XNedmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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