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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1a7bd9c265a1c11cf283f5cd0e212679c6a0a2a8f386d64bd297964d6e26ecaa' 
  AND token = 'b01s1Kv/u7d77G2+jtNIHV62PSWJRujfuoBJZ28dc+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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