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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '79aa95e66dc2471ce8051d1509dcbdd4a55fcfc60ecb763f5cd3117bf4d60e43' 
  AND token = 'pAxcelnG2c/5aXTto2mJcsg0DY2mWZp3JCUzcxkD0Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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