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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '969f1d621838c66eff7ae220af8d65d009abcc25edfb03a63e11f9103fb972bf' 
  AND token = 'I4/eAAZEvlv/LsrD1Oyfh3C3b3oiYZ87/t6eaZKux5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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