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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9595157f62d1bf970ed2a180efc9353de30f4740395f2a9f8e4c108156a2fb66' 
  AND token = 'rCVN/pqyo6i+8Rfx60BMjeYaQqO/7e65mJf214NJJ44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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